Fluid compressor



Margh 28, 1939. as. AIKMAN 2,151,325

' FLUID COMPRESSOR Filed Oct. 15, 1936 2 Sheets-Sheet 1 I INVENTOR F BURTON SAIKMAN ATTORNEY March 28,- 1939. a. s. 'AIIKMAN 2,151,325

' FLUID COMPRESSOR Filed Oct. .15; 1936 2 Sheets-Sheet g INVENTOR '(IIIIIIIIII,

I ATTORNEY BURTON s. NKMAN,

Patented-Man-ZS, I g I UNITED TATES PATENT orrlca FLUID comraas'soa Burton S. Aikman, Wiikinsburg, Pa-., assignor to Westinghouse Air Brake Company, Wilmerding, Pa., a corporation of Pennsylvania Application October 15, 1936, Serial No. 105,634

7 Claims. (chaos-22) This invention relates to fluid compressors and having a bolt headii for entering the tapped end more particularly to motor driven air compresof the shaft 1 to draw the shafts l and 9 tightly sors of the vertical reciprocating type. together. A washer ii is provided between the An object of this invention is the provision of bolt head [6 and a shoulder ll of the crankshaft a compressor unit in which the driving and driv- 9, and a key [9 is provided to key the shafts I en portions are so mechanically connected as to and 8 together. assure complete alignment between them at all' The compressor is of the multiple cylinder-intimes. line type and, as illustrated; is arranged for com- Another object of this invention is the provipression of gases in three stages. Three cylinlo sion of an air compressor unit in which the motor der bores 22, 23 and 24 are provided in the casm shaft and compressor crank shaft are so aligned ing 2 containing, respectively, pistons 25, 24 and" that when assembled they operate as a unit and "21 connected to connecting rods 24, 29 and "32' are supported by three bearings. that are respectively connected to cranks 38, 3 4

It is a further object of my.invention to proand 35 on the crank shaft 9. The cranks,

l5 .vide a compressor unit of the multiple stage type 34 and 35 are associated, respectivelyfwith the in which the several cylinders have the same bore low pressure, intermediate pressure, and high and accommodate pistons of similar construction pressurepistons 25, "and 21, and are-arranged and size. at angles of 120 from. one another as best Other objectsand advantages of my invention shown'in Fig. 2, the throw of the respective will be apparent from the following description cranks being substantially in proportion to the 20 -of one preferred embodiment thereof, reference ratio of compression between the several stages, being had to the accompanying drawings. as desired. In the drawings Fig. 1 is an elevational view, The pistons may be of the light weight typeand partly in section, of a compressor unit organized may each be provided with three rings, an upper in accordancewith my invention, ring 36 and two lower rings 31 and I8. The 25 Fig. 2 is a diagrammatic view showing the rela upper ring 36 functions as a pressure ring astion between the angular position and the throw well as a valve between the intake cham ers 42 of the several cranks of the crank shaft, and and the compression chambers 46,- 55, or'fl44 'at FigfB is a vertical sectional view showing the upper ends of thecylinders 22, 23, or 24, remeans for disassembling the motor shaft from spectively. The intake chamber for the low 80 the compressor crank shaft. pressure chamber 46 is in communication with Referring to the drawings a motor i is providthe atmosphere, and. the intake chambers for ed for driving the compressor 2 and having a the intermediate and the high pressurecylinders central motor frame 3 for supporting the motor are in com cation with the intercoolers'll' 36 and tothe ends of which are attached end frames and 48, respec vely. s

4 and 5, respectively, the end frame 4 supporting A valve cha ber 4|! is provided above the comball bearings-8 for carrying one end of the motor pression chamber-4C..1and contains 'a disc valve 41 shaft 1 and the end frame! supporting ball bearthat is adapted to engage a rib seat M to close ings 8 for carrying one end of the compressor communication between the chambers 45 and 44 crank shaft 9, the other end of which is supportand is urged to its seat by a spring 44, the lower 40 ed in bearin s l2 in the casing 2. end of which engages the valve 41 and the upper The motor I y be of standard construction end of which is contained within a bore in a cap excepting that the end frame 5 is provided with nut 49 closing an opening in the upper end of a'raised beveled portion It for interfitting a corthe cgfimg valve chamber is m cmm gfiz gg gfifg fg g ggg fl gg ggg is; munication with the inlet chamber 42 that is ase accurately with the bearing 82 when the two igz ifig ma gg 22 'z '3 "-f frames are drawn tightly together by bolts Ii. ppe passage Also. instead of theusual bearing for directly A valve chamber 541s provided above the comto supporting the end of the motor shaft 1 that is Press chamber and mains disc 60 adjacent the compressor unit the end'of the is to engage a rib Seat t0 formed IM -conical in shape as shown close colnmlmicatlim the chambers at i4 to interflt a conical shaped opening in the d 5 d i ur ed to its seat by a sp in il. s end of' the 'crank shaft 8, and is drilled and the lower end of which engages the valve 54 and p5 tapped to provide means for receiving a'screw IS the upper end'oi which is positioned within a 55 bore in a cap nut 59. The chamber 54 is in communication through pipe 62, intercooler 44 and pipe 63 with the inlet chamber 42 for the highpressure cylinder 2 A valve chamber 65 is provided above the compression chamber 64 of the cylinder 24, and contains a disc valve 66' that is adapted to engage a rib seat 61- and is urged to its seat by a spring 68, the lower end of which engages the valve 66 and the upper end of which is positioned within a bore in a cap nut 59' in the upper part of the casing. The valve chamber 65 is in communication through pipe I2 with a storage reservoir 13.

When this structure is assembled the motor end plate 5 is drawn tightly against the casing 2 of the compressor by means of the bolts ll, the beveled surface on the casing 5 cooperating with a corresponding surface on the casing 2. as shown at I! to bring the bearingsi, 8 and i2 into alignment. The conical end of the shaft I fits into the conical bore in the crank shaft 9, and after insertion therein the washer I1 and the screw I! are positioned, the screw being tightened to bring the conical end of the motor shaft 1 into snug engagement with the conical bore in the end of the crank shaft 9, the two shafts being keyed together by the key I9, as shown in Fig.

A conical depression 14 is provided in the crank shaft a'm alignment with the screw l5 to provide for the insertion of a plug 15 as shown in Fig. 3, which after a few turns of the screw l5 in a direction to unscrew it from the tapped bore in the end of the shaft 1, will engage a conical depression IS in the end of the plug 15 so that further movement of the screw I5 in thesame direction will cause the shaft 1 to be forced away from the crank shaft- 9, as shown in Fig. 3.

Many'modifications in the structure illustrated and described may be made within the spirit of my invention and I do not wish to be limited otherwise than by the scope of the appended claims.

Having now described my invention, what I claim as'new and desire to secure by Letters Patent, is:

1. In a machine assembly, a driving unit and a driven unit, each having a frame and a rotatable shaft therein, each of said frames being provided with a bearing for receiving and supporting the remote ends of the respective shafts, and one of said frames having a bearing for receiving and supporting the adjacent end of the shaft constituting a part of the other unit, said shaft being arranged to receive and support the adjacent end of the shaft associated with the first unit, means for coupling said shafts in power translating relation, and means 'for attaching the frames of said two units in position to align said several bearings.

2. In a machine assembly, -a driving unit and a driven unit, each having a frame and a rotatable shaft therein, each frame having. a bearing for receiving and supporting the remote ends of the respective shafts, one of said frames havin a bearing for receiving and supporting the adjacent end of the shaft constituting a part of the other unit, said shaft being arranged to receive and support the adjacent end of the shaft constituting a part of said first named unit, means for coupling said two shafts in aligned relation, and means comprising interfltting beveled portions of said frame positioned to align said several bearings when said frames are rigidly fastened together.

3. In a machine assembly, in combination, a

driving unit and a driven unit each having a frame and a shaft rotatable therein, said frames having confronting mounting faces thereon adapted to be secured against each other, the frame of each of said units having a bearing remote from the mounting face thereon and supporting one end of the shaft associated therewith, the frame of one of said units having a bearing adjacent the mounting face thereon and adapted to support the other end of the shaft associated with the other of said units, said end of said shaft having a tapered opening therein, the end of the shaft associated with the first named unit having a tapered portion adapted to be received by said tapered opening to provide a driving connection between said shafts and to support said end of the shaft of the first named unit.

4. In a machine assembly, in combination, a driving unit and a driven unit each having a frame and a shaft .rotatable therein, said frames having confronting mounting faces thereon adapted to be secured against each other, the frame of each of said units having a bearing remote from the mounting face thereon and supporting one end of the said shaft associated therewith, the frame of one of said units having a bearing adjacent the mounting face thereon and adapted to support the other end of the shaft associated with the other of said units, said end of said shaft having a tapered opening therein, said shaft being adapted to receive and support the end of the shaft associated with the first named unit, the mounting faces on said frames having interfitting tapered annular surfaces formed ,threon and arranged substantially concentric of the axes of said shafts, whereby when said mounting faces are drawn together said shafts are held substantially in alignment.

5. In a machine assembly, in. combination, a driving unit and a driven unit detachably secured together, each of said units having a rotatable shaft, one of said shafts being a crank shaft having a main bearing portion adjacent an end thereof, said bearing portion having a substantially axial bore extending therethrough, the other of said shafts having an end portion adaptedto be received bysaid bore, a member having threaded engagement with said other shaft and coopcrating with said crank shaft to draw the shafts together, said member being also adapted to exert force against a portion of said crank shaft spaced from said main bearing to press said shafts apart.

6. In a machine assembly, in combination, a driving unit and a driven unit detachably secured together, each of said units having a rotatable shaft, one of said shafts being a crank shaft having a main bearing portion adjacent an end thereof, said bearing portion having a tapered substantially axial bore extending therethrough, the other of said shafts having a tapered end portion adapted to be received by said bore, a member having threaded engagement with said other shaft and cooperating with said crank shaft to draw the shafts together, said member being also adapted to exert force against a portion of said crank shaft spaced from said main bearing to press said shafts apart.

7. In a machine assembly, in combination, a driving unit and a driven unit detachably secured together, each of said ,units having a rotatable shaft, one of said shafts being a crank shaft having a main bearing portion adJacent an end thereof. said bearing portion having a subv i 2,151,825 v a 3 stantiailyaxial bore extending therethrough, the

other of said shafts having an end portion adapted to be received by said bore, a member having threaded engagement with said other shaft and cooperating with the axial end face of said main bearing portion ofsaid crank shaft to draw said 7 shafts together, said member being aiso adapted to exert force against a surface on said crank shaft spaced from said main bearing portion and .disposed in alignment with said bore to presssaid shafts apart.

approx :5, mm; 

